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 #include &lt;QtGui&gt;
 #include &lt;QtNetwork&gt;

 #include &quot;httpwindow.h&quot;
 #include &quot;ui_authenticationdialog.h&quot;

 HttpWindow::HttpWindow(QWidget *parent)
     : QDialog(parent)
 {
     urlLineEdit = new QLineEdit(&quot;https:<span class="comment">//</span>&quot;);

     urlLabel = new QLabel(tr(&quot;&amp;URL:&quot;));
     urlLabel-&gt;setBuddy(urlLineEdit);
     statusLabel = new QLabel(tr(&quot;Please enter the URL of a file you want to &quot;
                                 &quot;download.&quot;));

     downloadButton = new QPushButton(tr(&quot;Download&quot;));
     downloadButton-&gt;setDefault(true);
     quitButton = new QPushButton(tr(&quot;Quit&quot;));
     quitButton-&gt;setAutoDefault(false);

     buttonBox = new QDialogButtonBox;
     buttonBox-&gt;addButton(downloadButton, QDialogButtonBox::ActionRole);
     buttonBox-&gt;addButton(quitButton, QDialogButtonBox::RejectRole);

     progressDialog = new QProgressDialog(this);

     http = new QHttp(this);

     connect(urlLineEdit, SIGNAL(textChanged(const QString &amp;)),
             this, SLOT(enableDownloadButton()));
     connect(http, SIGNAL(requestFinished(int, bool)),
             this, SLOT(httpRequestFinished(int, bool)));
     connect(http, SIGNAL(dataReadProgress(int, int)),
             this, SLOT(updateDataReadProgress(int, int)));
     connect(http, SIGNAL(responseHeaderReceived(const QHttpResponseHeader &amp;)),
             this, SLOT(readResponseHeader(const QHttpResponseHeader &amp;)));
     connect(http, SIGNAL(authenticationRequired(const QString &amp;, quint16, QAuthenticator *)),
             this, SLOT(slotAuthenticationRequired(const QString &amp;, quint16, QAuthenticator *)));
     connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));
     connect(downloadButton, SIGNAL(clicked()), this, SLOT(downloadFile()));
     connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

     QHBoxLayout *topLayout = new QHBoxLayout;
     topLayout-&gt;addWidget(urlLabel);
     topLayout-&gt;addWidget(urlLineEdit);

     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout-&gt;addLayout(topLayout);
     mainLayout-&gt;addWidget(statusLabel);
     mainLayout-&gt;addWidget(buttonBox);
     setLayout(mainLayout);

     setWindowTitle(tr(&quot;HTTP&quot;));
     urlLineEdit-&gt;setFocus();
 }

 void HttpWindow::downloadFile()
 {
     QUrl url(urlLineEdit-&gt;text());
     QFileInfo fileInfo(url.path());
     QString fileName = fileInfo.fileName();
     if (fileName.isEmpty())
         fileName = &quot;index.html&quot;;

     if (QFile::exists(fileName)) {
         if (QMessageBox::question(this, tr(&quot;HTTP&quot;),
                                   tr(&quot;There already exists a file called %1 in &quot;
                                      &quot;the current directory. Overwrite?&quot;).arg(fileName),
                                   QMessageBox::Ok|QMessageBox::Cancel, QMessageBox::Cancel)
             == QMessageBox::Cancel)
             return;
         QFile::remove(fileName);
     }

     file = new QFile(fileName);
     if (!file-&gt;open(QIODevice::WriteOnly)) {
         QMessageBox::information(this, tr(&quot;HTTP&quot;),
                                  tr(&quot;Unable to save the file %1: %2.&quot;)
                                  .arg(fileName).arg(file-&gt;errorString()));
         delete file;
         file = 0;
         return;
     }

     QHttp::ConnectionMode mode = url.scheme().toLower() == &quot;https&quot; ? QHttp::ConnectionModeHttps : QHttp::ConnectionModeHttp;
     http-&gt;setHost(url.host(), mode, url.port() == -1 ? 0 : url.port());

     if (!url.userName().isEmpty())
         http-&gt;setUser(url.userName(), url.password());

     httpRequestAborted = false;
     httpGetId = http-&gt;get(url.path(), file);

     progressDialog-&gt;setWindowTitle(tr(&quot;HTTP&quot;));
     progressDialog-&gt;setLabelText(tr(&quot;Downloading %1.&quot;).arg(fileName));
     downloadButton-&gt;setEnabled(false);
 }

 void HttpWindow::cancelDownload()
 {
     statusLabel-&gt;setText(tr(&quot;Download canceled.&quot;));
     httpRequestAborted = true;
     http-&gt;abort();
     downloadButton-&gt;setEnabled(true);
 }

 void HttpWindow::httpRequestFinished(int requestId, bool error)
 {
     if (requestId != httpGetId)
         return;
     if (httpRequestAborted) {
         if (file) {
             file-&gt;close();
             file-&gt;remove();
             delete file;
             file = 0;
         }

         progressDialog-&gt;hide();
         return;
     }

     if (requestId != httpGetId)
         return;

     progressDialog-&gt;hide();
     file-&gt;close();

     if (error) {
         file-&gt;remove();
         QMessageBox::information(this, tr(&quot;HTTP&quot;),
                                  tr(&quot;Download failed: %1.&quot;)
                                  .arg(http-&gt;errorString()));
     } else {
         QString fileName = QFileInfo(QUrl(urlLineEdit-&gt;text()).path()).fileName();
         statusLabel-&gt;setText(tr(&quot;Downloaded %1 to current directory.&quot;).arg(fileName));
     }

     downloadButton-&gt;setEnabled(true);
     delete file;
     file = 0;
 }

 void HttpWindow::readResponseHeader(const QHttpResponseHeader &amp;responseHeader)
 {
     if (responseHeader.statusCode() != 200) {
         QMessageBox::information(this, tr(&quot;HTTP&quot;),
                                  tr(&quot;Download failed: %1.&quot;)
                                  .arg(responseHeader.reasonPhrase()));
         httpRequestAborted = true;
         progressDialog-&gt;hide();
         http-&gt;abort();
         return;
     }
 }

 void HttpWindow::updateDataReadProgress(int bytesRead, int totalBytes)
 {
     if (httpRequestAborted)
         return;

     progressDialog-&gt;setMaximum(totalBytes);
     progressDialog-&gt;setValue(bytesRead);
 }

 void HttpWindow::enableDownloadButton()
 {
     downloadButton-&gt;setEnabled(!urlLineEdit-&gt;text().isEmpty());
 }

 void HttpWindow::slotAuthenticationRequired(const QString &amp;hostName, quint16, QAuthenticator *authenticator)
 {
     QDialog dlg;
     Ui::Dialog ui;
     ui.setupUi(&amp;dlg);
     dlg.adjustSize();
     ui.siteDescription-&gt;setText(tr(&quot;%1 at %2&quot;).arg(authenticator-&gt;realm()).arg(hostName));

     if (dlg.exec() == QDialog::Accepted) {
         authenticator-&gt;setUser(ui.userEdit-&gt;text());
         authenticator-&gt;setPassword(ui.passwordEdit-&gt;text());
     }
 }</pre>
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